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 ###Instrução: Qual Local tem um Campo Principal no estádio Mong Kok?
 ###Tabelas: CREATE TABLE 2003_fedex_ground_winners (2003_fedex_ground_winners_id AUTO_INCREMENT PRIMARY KEY, Week INT, Player VARCHAR, Team VARCHAR, Opponent VARCHAR, Carries INT, Yards INT, Average VARCHAR, Touchdowns INT) CREATE TABLE k (k_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, League/Division VARCHAR, Home Ground VARCHAR, Location VARCHAR, Position in 2012-13 VARCHAR) CREATE TABLE group_b_relegation (group_b_relegation_id AUTO_INCREMENT PRIMARY KEY, Position INT, Club VARCHAR, Played INT, Points VARCHAR, Wins INT, Draws INT, Losses INT, Goals for INT, Goals against INT, Goal Difference INT) CREATE TABLE parliamentary_parties (parliamentary_parties_id AUTO_INCREMENT PRIMARY KEY, Abbr. VARCHAR, Political Leader VARCHAR, International Affiliation VARCHAR, Votes ( 2012 ) VARCHAR, House of Rep. seats INT, Senate seats INT, European Parliament seats INT) CREATE TABLE list_of_contestants (list_of_contestants_id AUTO_INCREMENT PRIMARY KEY, Celebrity VARCHAR, Known for VARCHAR, Age INT, Professional VARCHAR, Series INT, Place VARCHAR, Dances INT, Highest score INT, Lowest score INT, Aggregate INT, Average VARCHAR)  
SELECT Location FROM k WHERE Home Ground = mong kok stadium